Hi all,
there's an Exchange 2013 server running without problems during "regular" use, but when it comes to POP3 and/or IMAP (we really need that for some systems), everything is fine until there's a message with an attachment of about 100kb or more.
We can poll messages with smaller attachments without problem, but bigger sizes won't work.
So for testing I tried POP3 within Outlook Express, it gives Error 0x800CCC0F
Telnet to TCP110 simply breaks up the connection when I try "retr"
IMAP shows those messages as "to be deleted", but they are accesible within OWA.
Test-PopConnectivity (also for IMAP) runs smoothly and successfully.
Firewall is opened for all connections.
Problem is and has always been there. The server is updated to the newest SP/updates.
I tried both 110/143 and corresponding SSL - no difference.
Pop3 and Imap logging shows no errors
There's Trend Micro Messaging Security installed, but has been disabled for testing - no difference. (Issue has been there before installation of TM)
So, any ideas how to fix this? I'd appreciate...
Thanks in advance,
Robert